WALNUT APHIDES IN CALIFORNIA. 
15 
Fig. 6. — Chromapliis juglandicola: Oviparous 
female, penultimate instar. (Original.) 
or dusky gray legs and antennae. The oviparous or sexual female 
molts four times but does not differ in appearance from the viviparous 
form until the third molt is passed. 
THE OVIPAROUS FEMALE, AFTER THE THIRD MOLT (FIG. 6). 
Rather smaller and narrower than the full-grown form. General color pale gamboge- 
yellow, sometimes lemon yellow. Body twice 
as long as wide. Eyes bright red. Head with 
six erect, capitate spines on the anterior margin. 
Antennae short, reaching barely to the middle of 
the mesothorax; 7-jointed, joint III the longest, 
joints IV and V subequal, joint VI longer than 
its spur or filament. Spur dusky, rest of anten- 
nae pale lemon yellow. Head, thorax, and ab- 
domen with two longitudinal rows of oval black 
spots on the dorsum. Thorax and abdominal 
segments 1-5 with two lateral longitudinal rows 
of circular black spots, on which are situated 
small tubercles bearing capitate hairs. Such 
tubercles also occur on the black dorsal spots. 
Eighth segment of the abdomen unmarked, 
bearing on its posterior margin a fringe of six 
capitate hairs. Legs pale greenish-yellow with 
the characteristic knee spot on the hind femora 
only; tarsi gray. Cornicles on the sixth segment, quite small, wider than long, pale 
lemon-yellow. Cauda equal in length to the hind tarsus, pale yellow, rounded. Beak 
very pale, almost white, reaching to the anterior coxae. Measurements: Length of 
body, 1.51 mm.; width of body, 0.76 
mm.; antennae, joint I, 0.063 mm.; 
joint II, 0.048 mm.; joint III, 0.136 
mm.; joint IV, 0.083 mm.; joint V, 
0.085 mm. ; joint VI, 0.086 mm. ; fila- 
ment, 0.021 mm. 
Described from specimens 
collected at Walnut Creek, CaJ., 
and San Jose, Cal., October 16 
to 26, 1912. 
THE OVIPAROUS FEMALE, ADULT STAGE 
(FIG. 7). 
General color gamboge, varying in 
newly molted examples to lemon yel- 
low and in older individuals to salmon 
pink or with a distinct brownish tint. 
Eyes crimson. Head and prothorax 
with indefinite dusky brown markings. 
Ocular tubercles small. Anterior mar- 
gin of the head with six capitate hairs 
projecting forward. Thorax mottled all over with shades of brown, its lateral margins 
lighter. Prothorax with two capitate hairs on either side of its posterior portion. Ab- 
domen with two or three hairs on the lateral margins of each segment. Segments 4 and 
5 and posterior half of 3 with dark brown or black markings which generally coalesce to 
Fig. 7. — Chromaphis juglandicola: Oviparous female. 
Right antenna. (Original.) 
